Discovery of tidal RR lyrae stars in the bulge globular cluster M62

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dc.contributor.authorMinniti, Dante
dc.contributor.authorFernández-Trincado, José G.
dc.contributor.authorRipepi, Vincenzo
dc.contributor.authorAlonso-García, Javier
dc.contributor.authorContreras Ramos, Rodrigo
dc.contributor.authorMarconi, Marcella
dc.date.accessioned2023-05-02T21:27:22Z
dc.date.available2023-05-02T21:27:22Z
dc.date.issued2018-12
dc.descriptionIndexación: Scopus.es
dc.description.abstractThe RR Lyrae (RRL) rich globular cluster M62 (NGC 6266) is one of the most massive globular clusters in the Milky Way, located in the dense region of the Galactic bulge, where dynamical processes that affect the survival of globular clusters are maximized. Using Gaia second data release data we have found clear evidence for an excess of RRLs beyond the cluster tidal radius of M62, associated partly with stars stripped into the Galaxy field. This is confirmed with new Visible and Infrared Survey Telescope for Astronomy Variables in the Via Lactea Extended survey observations, which discard any differential reddening effect as the possible cause of the observed RRL density excess. We also determined the orbit of M62 using accurate new measurements of its distance, radial velocity, and proper motions, finding that its orbit is prograde with respect to the direction of the Galactic rotation. Orbits are integrated in the non-axisymmetric galactic model GravPot16, which includes the perturbations due to the central Galactic bar. M62 shows a particular orbital behavior, having a dynamical signature of the bar-bulge region. The small extra-tidal RRLs extensions that are observed are roughly aligned toward the galactic center, and the direction is almost perpendicular to the galactic plane, not with its motion along its orbit. This may be a clear sign of bulge-crossing shocks during the last passage close of the cluster toward its perigalacticon. M62 would be the first clear observed case of bulge shocking in the inner Galaxy acting on a globular clusteres
dc.description.urihttps://iopscience-iop-org.recursosbiblioteca.unab.cl/article/10.3847/2041-8213/aaf1cd
dc.identifier.citationAstrophysical Journal Letters Volume 869, Issue 110 December 2018 Article number L10es
dc.identifier.doiDOI: 10.3847/2041-8213/aaf1cd
dc.identifier.issn2041-8205
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/49183
dc.language.isoenes
dc.publisherInstitute of Physics Publishinges
dc.rights.licenseAtribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectGalaxy: Bulgees
dc.subjectGalaxy: Evolutiones
dc.subjectGalaxy: Kinematics and Dynamicses
dc.subjectGlobular Clusters: Generales
dc.titleDiscovery of tidal RR lyrae stars in the bulge globular cluster M62es
dc.typeArtículoes
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